Rubber-mixer



D. R. BOWEN AND.C. F. SCHNUQK.

RUBBER MIXER. APPLICATION FILED JAN 16; 1919.

Patented Oct. 26,1920.

"2 SHEETS-SHEET 1.

' D. R. BOWEN AND C. F. SCHNUCK.

RUBBER MIXER.

APPLICATION FILED-JAN. I6, 1919.

Patented Oct. 26, 1920.

2 SHEETS-*SHEET 2.

Q mBesrm DAY ID E B b WEN.A 1 Tb CA Rnr. soHNu K, QF'ANSONIIA, CONNECTICUT, AssICNoRs To FARRELIOUNDRY ANDMACHINE COMPANY, or ANSONIA, CONNECTICUT, A com I PI BA or ON C IC T all, 101mm it may 007mm Bezit *known thatjwe, DAVID. -R. Bownx and CARL F SCHNUCK, both citizens of the United States, and 'both residingin An f sonia, county of New Haven, State of Connecticut, have invented certain new and useful "Improvements in "Rubber-Mixers, of

' mentioned type. 1 II 1 I \Veann to provide 'aq rery simple and 'efli-jx cienti form of duplexi machine,"v in which" the 'frubbervand powder canbe fedifintofthe min- 35.

or cracks. .or intothe iro'torbearing I Our machine is'also' provlded with :efiiy I II I I I I I I theoppo's1te rotation of, the. rotors. Each which the following is-a; full, clear, and

exact'description. I j

In'our application, Serial No. 270,837.

we 'ha'veshQWnFand described arubber mixer of. the single 'cylinder}typehaving I improved] provisions for the feeding in or charging-of the difi'erentf ngredients to be mixed,

the expulsion of powder from the casing-- during. the mixing overcome to a largev d egree.

" "to a machine of the duplex tKpe having'two ambers or cylinders thatareinfree communication with parallel rotors arranged in c each' oth'er. and one er the/main objects. in

view is the applicationpfcertainnew prim ci-ples of charging orffeeding set forthin the. companion case to machines of. this jlast'a; I

- if n'respect'to each other,ls"o that thematerial is worked back and forth alternately. from'one ing chamber'. gravity in Zvery convenient way during jthej rotation I of the rotors without. '-'creating' an objectionable [dust I cloud; {It is unnecessary to". holdfthe mass againstl the rotating-bladesJby means of1a -f piston or other pressurefdevice, the einploymentfiof which is objectionabldbyreason of 1 the factthat whenit isl'move'd to,theioperative position: it displaces airgin-the mixing chamber and consequently- "forces some of the powderout of the casing? through leaks cient means; for preventing slippage .ofithe (which .usuallyflinclude rubber chunks of comparatively large size and fill The present invention relates primarily Bosnian-MIXER. I

I Specification of Letters Patent. P t t d Oct. 26 1920. .igpplication filed was is, 1919. Seria1- No.-2 71 tions of parts to be hereinafter described.

and claimed. I

In the accompanylng drawings i Fig. 2 is a top plan view of the-same. Fig. 3 18 an end elevation looking from the'left of F ig.'1 with certain parts omitted.

F ig. 4 is an enlarged section online 4.4

of Fig. 2.

Fig. 5 is a section on line 55 of Fig. 1.

Fig. (Sis a sectionon linefi-fiof Fig.2. The machine selected for illustration comprises a casing 10 having a duplex niixing or working chamber'consisting of intercommunicating partly cylindrical chambers 11 between which lower and upper longi tudinaluridges 12,-"12 are arranged.'- In feachgif-the chambersfor compartments 1.1 of I the duplex chamber "is a'horizontal rotor 13 comprisingja shaft with blades 14. In the form shown, each rotor'has-two blades, one being arranged, in one end vof. the correspending compartment; land "the' other being located in ,thelo ther end ofsaidcompartment,qsaid blades having working faces adapted. to" mash .thefmaterial against the finner'surface of the chamber side wall. TIhe-Tblade's. areal-ranged ,on the shaft at an angle and are diametrically] located with end of the compzn'tment 11- 'to the other as the rotor rotates. while being mashed or ber' so as to imix the ingredients thoroughly.

iTheqrotors'f .13 rotate in opposite directions and the material :is thrown'back'and forth end ,of said' shaft a. 'pinion l6 is applied.

l-i'iri'eshing"with a similar pinion 17021 the shaftiof'the other rotor-so -as to provide for :rotorshaft has. suitable" bearings in the heads l8," l19 fof i the mixing chamber. These ards-2O and 21 respectively and. are-adapted smeared againsttheside wall-of the chamfrom oneflchamber 11; tojtheyothe'r through I the intervening somewhat narrower space between the ridges 12. 12 that separate the by-pmeans of a large gear wheel 15, applied to one-end of its shaft and at theopposite headsflare carried by end frames or s'tandtobeattached to the side wall of the casing two side sections 10 ig. 4) bolted together at the top by bolts 22. The casing hasa movable lower section 23, which in this case is hinged at 2-}, so as to provide a swinging discharge closure. The door' 1s dropped down when it is desired to d scharge the mixing chamber and whendlscharge is completed, the door is held in the.

closed position by any suitable means, such as a cam 25. Inasmuch as the arrangement of the door forms no part'of our invention,

it will not be greater detail.

In accordance with our necessary to describe it in charging opening is located in the end wall or head of the chamber, through which the material will readily pass into voids or areas of low pressure at the rear faces of two or more of the rotor blades, arranged on different shafts, whence such material is takenv up by the-blades on further rotation and thoroughly mixed by the working faces of the blades in connection with the inner surface of the side wall of the duplex chamber. In the form shown, the end wall or head 19 is provided with a charging opening 26 located at the upper part of the duplex chamber above and between the rotor shafts. This charging opening is located at the lower inner part of'a charging hopper '27, which can be conveniently formed by casting the same integral with the head 19. The hopper 27 is open at the top and has an inclined wall over which the material slides in a downward and inward direction into the mixing chamber- The charging opening 26, in the particular form shown, is located at about the'level of the rotor shafts, as shown in F ig. 6. At the upper part of 'its inner side, the hopper is closed in by surfaces 10, 10 of the sections 10*, 10 respectively. These surfaces 10, 10 present a substantially upright inner wall for the hopper,

the charging opening 26 being. located at the bottom of such inner wall, which as shown.

in Fig. 6, does not extend as far downward as the bottom of the hopper and, therefore, leaves acharging space through which comparatively large chunks of rubber as wellas the powder can be introduced.

In the operation of the mixer, the spaces at the rear faces of the rotor blades Mare not completely filled with material and in such spaces there exist voids or areas of low pressure caused by the rotation ofthe blades into which rubber and powder canbe readily introduced through the charging opening 26. The rubber chunks and powder are simt rotor. invention; means are provided whereby the material to be.

7 ary.

ply dumped into the hopper 27, either together or in any desired sequence and such material slides down into the bottom of the hopper by gravity and passes into the end of the mixingchamber, either by gravity, or by the agitation or drawing in action created by the rotating blades, or by both gravity .and agitation. The material introduced into behind the corresponding blade of the other \Vhen the t-reatedmass has become plastic and homogeneous, the machine can be dis charged by opening the door 23 or in any other suitable manner.

One of the important advantages of our invention is that it provides means for feed ing in the material in a very simple and convenient manner without the use of any follower. to maintain the material in contactwith the blades. The blades operate on the material by mashing or smearing it against the side walls of the compartments. These compartments present large working surfaces which are substantially continuous throughout their length, there being no in terruption of said surfaces intermediate the ends of the chamber for providing a charging opening, as has heretofore been custom- Tlie charging opening'is conveniently located at the end of the chamber. rather .than in the side wall, and no special means is necessary for forcing the material into the chamber through the charging opening.

Escape of the material being treated is prevented by the blades adjacent the charging opening, which blades force the material inwardly and draw it away from thecharging opening. While the. blades on the right hand ends of the rotors, as'shown in Fig. 5, force the material toward the charging opening, their action is neutralized by the left hand blades, which take up the material and force it back again into the right hand.

end of the duplex chamber before it can pass to the charging opening. The powder can be quickly'and directly incorporated with the rubber y our arrangement, but if a cloud of dust is created inside the mixer before the powder is fully incorporated in the mass.

than the space between the rotor shafts in the mixing chamber.

In the center, the charging opening is not l2 on the upper part of the chamber.

such dust. is drawn away from the charging Y as'deep as it is on the s1des,-ow1ng to the provision of the ridge Serial No. 251,640.

on the interior surfaces of the compartmerits 11,'which would result in no us eful work being performed by' the rotors, we

prefer to mount the rotors in a special manner, and preferably each rotor blade is movable toward and away from the cooperating inner surface of the chamber to obtain a varyinggrip on the material as the blade rotates. In the particular form shown, both rotor shafts are eccntrieally mounted in' the respective compartments, so that the blades "of each shaft come nearer to they chamber wall at one point than they do at another "point. By this arrangement the clearance opening between'the chamber wall and the working surface of the blade is constantly changing and this expedites considerably the movement of the outer'edge of the blade into firm bitingengagement with the mass, so that the latter will be effectively held and operated upon. 'As the blade ialternately advances toward and recedes from the chamber wall,the-material-i;s enabled to work well over the blade tip into a position in which it will be effectively held by the blade itself against the chamber wall,

while the blade by means of its working I face is doing effective work upon such material. In the particular formshown, larger clearance spaces are provided: at the top of the compartments than at the bottom, but this arrangement could obviously. be reversed, if desired, so as 'toprovide larger clearance spaces at the bottoms of the re spective compartments. however, to have 'the larger clearances adjacent the charging opening,.as shown, as this facilitates the introduction of the charge. Inother words, where the charging opening is located at the upper part of the compartments, the larger clearance spaces are preferably at the tops of-the compartments. j 7

Various changes may be .ma'dein the "details of' the construction herein described without departing from the scope of our invention, as defined in the claims.

lVe donot claim broadly herein the method of mixingrubber in a mixer havmgxa m xing chamberand rotating blades therein for working the material back and forth'in said chamber, which comprises feeding rubber and powder through one end wall of the mixing chamber into the vacant space at the rear of oneof the blades; as claimed-in our application. Serial No. 270,837,11'01' do.

we claim broadly herein the featureof arranging a rotor. for moving the material back and forth, eccentrically in its chamber,

whereby there is a different clearance between the blades of the rotor and thechamber wall at different points in the rotation of the rotor, as claimed in It is preferable,

our application, a

chamber having a charging opening in its end wall.

2. In a machine of the character described, a working chamber, a plurality of rotors there-in which work the material back and forth in said chamber, said chamber having a charging opening at the end through which material is fed to said rotors. 3. In a machine of the character described, aworking chamber, a pair of rotors in said chamber for forcing the material back and forth, and 'a head at the end of said chamber having a charging opening.

41, In a machine of the character described. a working chamber, a pair of rotors in said chamber for forcing the material back and forth, and a head at the end of said chamber having a charging opening located between said rotors.

5; In a machine of the character described, aworking chamber, a pair of substantially parallel rotors therein which work thematerial back and forth, said chamber having an end wall with a charging opening above and between the rotors.

6, In a machlne of the character descr1bed,'a working chamber, a pair of substantially parallel rotors therein which work the materialfrom one end of the chamber to the other'and back again, and a detachable head on one end of said chamber having a charging opening above and between the rotors. I

scribed,- a worki'ngichamber, a pair of rotors therein which force the material lengthwise ofsaid chamber, and a detachable'head at the end of ,:the chamber having a chargingopening and ahopper associated with said charging opening.

'9. -Ina machine of the character described.'a,,working chamber, a pairof 'substan'tiallyparallel rotors in said chamber which work'the material back and forth,"

anda detachable head at. the end of said chamber having a charging opening located above and/between the rotors. said head "having 'a-"hopper associated with said charging opening.

10. In -amachine of the character. described. a working chamber. a pa1r'ofsubstantially parallel rotorsiin said chamber which work the material back and forth,

and a detachable head at the end of said chamber having a charging openinglocated above and between the rotors, said head having a hopper associated with said charg-. ing opening, said hopper being open at the top and extending beyond the end of the chamber.

ll. In a rubber mixer, a working chamher, a plurality of rotary elements in said chamber having blades with front faces for mashing and mixing the material, the blades foffl eachfl element being arranged to workthe material back and forth-in said chamber and said chamber having a charging opening through "which material is charged directly into the voids at the rear faces ofthe; blades of both of said elements. .12."?i1i a rubber'mixer, a Working. chamher, and a plurality of rotary elements in said chamber having mixing blades with, working faces for mashing the. material] against the side wall of the chamber, said chamber having an'opening in its end wall through which material to be mixed .is

drawn by the rotating blades into the voids at the rear of said blades. 13. In, a rubber mixer, a working chamber, a. pair oiifrotor s therein having blades over the end Wall of said orking chamber, said end Wall having a charging opening in path rotation of blades of both rotors.

14;. The method oi introducing material into a mixer having amlxingchamber with a pair of bladed rotors therein,rwhich comp'rises drawing material into the chamber by the rotation of the bladesfof both rotors.

15-. The method of introducing material I into a' mixer having a mixing chamber With'a pair of bladed rotors therein, whlch comprises drawinginater al into the chamher by-the rotation ofthe blades of both raters through one of the end alls of the into a -mixer having a mixing chamber chamber. a H

16. The method of introducing material w th a pair of bladed rotorstherein, which see, drawing material ..into-the chain y the rotation of. the blades of both rotors through one oftl e end Walls of the chamber into vacant spaces at the rear facesof blades o'f'the respective rotors.

,17. The method of introducing material into a mixer-having a mixing chamber with a plurality'of bladed rotors therein,

' which; comprises feeding the material into the chamber at one end thereof, so that it passe into the vacant spaces at the rear faces of the blades of said rotors.

18. The method of mixing rubber and the like in a suitable mixing chamber by means of bladed rotors which work the material back and forth in said chamber, whlch comprises feeding material by gravity'into the end of the mixing chamber between the rotors.

19. In a riibber mixema duplex chamber v respective compart- I having difierent clearances atthe tops of i the compartments than at the bottoms thereof, said chamber havinga charging opening at its end. 7

.22. In a. rubber mixerya duplex chamber having partly cylindrical 'compartrrient-s, and

bladed rotors in the respective compartments, the blades of the respective rotors having different clearances at the tops oi the compartments than at the bottoms thereof, said chamber having a charging openblade clearance.

22-3. In a rubber mixer, a duplex chamber having compartments and bladed rotors in the respective compartments, the blades of said rotors having greater clearances at the ing at its end adjacent the points of greatest tops of said compartments than at the bottoms thereof.

24. In a rubber mixer, a duplex chamber having compartments and bladed rotors in v the respectivecompartments, the blades of saidrotors having greater clearances at the tops of said compartments than at the bot toms theree said chamber'having a charging opening at the end communicating with the upper portions of both compartments.

25. In a rubber mixer, a duplex'chamber having partly cylindrical compartments,

bladed rotors in the, respective compait- "ments and a hopper at one end of the chamber communicating. with the interior of the latter. I I

26. In a rubber mixer, a duplex chamber having partly cylindrical compartments,

bladed .ro'tors in the respective compartments, the end portion of said chamber having a charging opening and a hopper from Whichmaterial'moves through said opening intosaid compartments.

27 In a rubber, compounding machine, a duplex chamber having partly cylindri cal compartments in free communication" with each other, said chamber having a head at one end, longitudinally arranged substam tia-lly parallel rotors in the chamber lo cated in the, respective compartments, each of said rotors having blades for Working the material back and forth :i'nthe corresponding compartment. and said head having a charging opening therein through which material is introduced into both of said compartments simultaneously, as described.

28. In a rubber mixer, a duplex chamber, having partly cylindrical compartments, and bladed rotors eccentrically arranged in the respectix'e compartments. the clearance between the rotor blades and the compartment walls being varied at different points in the rotation of said rotors.

i 29. In a rubber mixer. a duplex chamber,

having partly cylindrical compartments, and

said v compart-ments than at another side tliereof.' V

In witness whereot'. we have hereunto 20 set our hands on the 8th day of January, 1919.

DAVID R. BOWEN. CARL F. SCHNUCK. 

